.header{
    width: 100vw;
    height: 0.8rem;
    position: fixed;
    left: 0;
    top: 0;
    background-color: #ffa500;
}
.header-title{
    width: 100%;
    text-align: center;
    line-height: 0.8rem;
    color: #fff;
    font-size: 0.4rem;
   
}
.header-btn{
    position: absolute;
    left: 0;
    top: 0;
    color: #fff;
    line-height: 0.8rem;
    font-size: 0.4rem !important;
}